Data assurance method for optical storage media and optical storage device
AssigneeFujitsu Limited
InventorHiroshi Tani
Life of this patent
Estimating the term…
Abstract
A data assurance method controls an optical head according to the difference between the device temperature and the temperature of inserted removable optical storage media. A rate of temperature change c is calculated from the output of a temperature sensor which detects the device temperature, and then the temperature of the media is estimated. A transition is made to special processing, and a return is made from special processing in a state with a temperature difference to normal processing depending on the rate of temperature change. Consequently a return to normal processing can be made safely and quickly.
Claims20
A data assurance method for optical storage media, in an optical storage device which optically reads from and writes to inserted removable optical storage media, comprising the steps of:
- detecting a temperature of said optical storage device using a temperature sensor;
- calculating a rate of temperature change from said detected temperature;
- determining an estimated temperature of said optical storage media based on said rate of temperature change;
- changing, according to the temperature difference between the device temperature of said temperature sensor and said estimated temperature, at least the write conditions, for an optical head to perform said reading and writing, from normal conditions to special conditions suited to said temperature difference;
- and
- detecting a change in the polarity of said rate of temperature change, and returning from said special conditions to said normal conditions.
An optical storage device, which optically reads from and writes to inserted removable optical storage media, comprising:
- a temperature sensor which detects the temperature of said optical storage device;
- an optical head which reads from and writes to said optical storage media;
- and
- a control unit which controls said optical head,
- and wherein said control unit calculates a rate of temperature change from said detected temperature, determines an estimated temperature of said optical storage media based on said rate of temperature change, changes, according to the temperature difference between the device temperature of said temperature sensor and said estimated temperature, at least the write conditions for said optical head from normal conditions to special conditions suited to said temperature difference, detects a change in the polarity of said rate of temperature change, and returns said conditions from said special conditions to said normal conditions.
Dependencies are inferred from the claim text.